U.S. patent application number 11/645518 was filed with the patent office on 2008-05-29 for device for locking and releasing a scrwe bit.
Invention is credited to Chi - Fen Meng.
Application Number | 20080121075 11/645518 |
Document ID | / |
Family ID | 37896920 |
Filed Date | 2008-05-29 |
United States Patent
Application |
20080121075 |
Kind Code |
A1 |
Meng; Chi - Fen |
May 29, 2008 |
Device for locking and releasing a scrwe bit
Abstract
This invention is to introduce a screwdriver bit holder
structure, whose holder body has a polygon hole in one end, and
inside the polygon hole set an inner spring and a sliding tube. The
holder body is externally clipped by a c-clamp, ahead of which are
symmetric front balls and holes, and behind which are symmetric
middle and back balls and holes that can fit with front and back
grooves respectively to confine the movement of the sliding tube. A
fixing cap is capped on the holder body around polygon hole. In the
back of inner hole of the fixing cap sets a limiting ring, and in
the front sets a front recess and a back recess that is designed,
by sliding the cap forward and backward along the holder body, to
push front balls to fit into the fitting concaves of the bits so as
to fix them tightly with the holder body or loose front balls from
fitting concaves to release the bits. An outer spring is also set
between the back recess and c-clamp to make the fixing cap to slide
forward and backward against the holder body more easily.
Inventors: |
Meng; Chi - Fen; (Taichung,
TW) |
Correspondence
Address: |
MENG CHI - FEN
P. O. Box 215
TAICHUNG
40099
omitted
|
Family ID: |
37896920 |
Appl. No.: |
11/645518 |
Filed: |
December 27, 2006 |
Current U.S.
Class: |
81/177.85 |
Current CPC
Class: |
Y10T 279/3406 20150115;
Y10S 279/906 20130101; Y10T 279/17196 20150115; Y10T 279/17752
20150115; B25B 15/001 20130101; B25B 23/0035 20130101; Y10S 279/905
20130101 |
Class at
Publication: |
81/177.85 |
International
Class: |
B25B 23/16 20060101
B25B023/16 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 23, 2006 |
TW |
095220643 |
Claims
1. A screwdriver bit holder structure comprising: a holder body
that sets a polygon hole along the shaft axis, a cylinder cavity
sharing the same axis of center as the polygon hole, an inner
spring and a sliding tube inside the cylinder cavity, and front
ball holes and front balls in one end; a fixing cap with an inner
hole is capped around said polygon hole on said holder body and an
outer spring is set inside said fixing cap; the features
comprising: the said holder body is clipped by a c-clamp, on one
side of which said outer spring is against, and on the other side
of which set middle and back ball holes on said holder body with
middle and back balls nesting inside the said holes; a front and a
back groove are set on said sliding tube to contain said middle and
back balls; at the front end of said inner hole of said fixing cap
set a front and a back recess for said front balls to stay against,
and at the back end sets a limiting ring to limit its movement up
to the said c-clamp.
2. The screwdriver bit holder structure of claim 1, wherein a
stopping ring is set at the back of said back groove of said
sliding tube for said back balls to stay against and stop said
sliding tube's forward moving.
3. The screwdriver bit holder structure of claim 1, wherein a
magnet is set at the front end of said front groove of said sliding
tube.
4. The screwdriver bit holder structure of claim 1, wherein the
radius of said front recess is greater than that of said back
recess.
Description
FIELD OF THE INVENTION
[0001] This invention is to introduce a screwdriver bit holder
structure, which can prevent driver bits from springing out
unexpectedly while being unloaded.
BACKGROUND OF THE INVENTION
[0002] A prior art was proposed as Taiwan Patent No. M293121
"Screwdriver Bit Holder Structure (1)", which comprises a
screwdriver bit holder that has a polygon hole allowing load or
unload of a driver bit, and at least a shaft-axis hole on top of it
allowing balls to fit in; a ring clipped on the holder body
externally, pushed by a spring component that is set between the
ring and the holder body, and its inner part has a pressing wall
used to push balls to fix bits. Its features include: at least one
shaft-axis hole at the lower part of the holder body for balls to
fit in, and a cylinder cavity at the inner part of the polygon
hole. A spring component and fixing plate are set inside the
cylinder cavity, and the fixing plate has a triangle recess facing
the shaft-axis hole. The ring has a concave and a pushing surface
facing the shaft-axis hole, and the pressing wall of it is
gradient-curved surfaced. Based on aforementioned structure, the
pushing surface of the ring can push balls into the triangle recess
so as to position the ring and fixing plate, and then utilize the
gradient-curved surfaced pressing wall to push balls fit into the
concaves of driver bits for tightening.
[0003] Although driver bits can be fixed in the polygon hole
tightly based on aforementioned structure, it may cause safety
concern because the spring component fixed in the fixing plate will
suddenly and fully release accumulated power, then pushes fixing
plate move outwards rapidly, which further forces the magnetized
bits to spring out of the bit holder too powerfully to a dangerous
extent when the bits are released by pushing down the ring until
the top and bottom balls can leave the concaves of the bits and the
triangle recess of fixing plate.
[0004] Throughout rigorous tests and researches, the inventor
finally devised such an improved structure that enables a driver
bit to be unloaded from polygon hole more gently to prevent dangers
from powerful ejection of the bit occurring in prior arts.
Therefore, a patent application is hereby being filed based on the
absolute novelty and capability of industrial application of the
invention.
SUMMARY OF THE INVENTION
[0005] The screwdriver bit holder structure proposed in this
invention is mainly intended to reach following two purposes.
First, it can be assembled from the front end of the holder body,
simplifying the installation complexity. Second, it enables driver
bits to be fixed smoothly and tightly into the holder body, and to
be unloaded safely by avoiding powerful ejection occurring in prior
arts.
[0006] To reach aforementioned purposes, the invention proposes a
screwdriver bit holder structure, which comprises: a holder body
that sets a polygon hole in one end for loading bits, and at the
end of the polygon hole sets a cylinder cavity that houses a inner
spring and a sliding tube; a c-clamp clips the holder body
externally, and ahead of which are front balls that fit in or unfit
from the concaves positioned in the middle of the bits to fix or
loose bits; behind the c-clamp are symmetric middle and back balls
and holes that can fit with front and back grooves to confine the
movements of the sliding tube; A fixing cap is capped on the holder
body around polygon hole. A limiting ring is set at the back of the
fixing cap, and a front recess and a back recess are set in front
of the fixing cap that is designed, by sliding the cap forward and
backward along the holder body, to push front balls to fit into the
fitting concaves of the bits so as to fix them tightly with the
holder body or loose front balls from fitting concaves to release
the bits. An outer spring is also installed between the back recess
and c-clamp. As a solid improvement, above components enables the
proposed screwdriver bit holder easily assembled, and makes sure
the bits be loaded tightly or unloaded easily and safely.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] FIG. 1-A breakdown view of the structure of exemplary
embodiment
[0008] FIG. 2-A put-up view of the structure of exemplary
embodiment
[0009] FIG. 3-A sectional view based on FIG. 2 when a driver bit is
inserted but not yet fixed inside the polygon hole
[0010] FIG. 4-A view of FIG. 3 at different angle
[0011] FIG. 5-A sectional view based on FIG. 2 when a driver bit is
fixed inside the polygon hole
[0012] FIG. 6-A view of FIG. 5 at different angle
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0013] Please read the description of an exemplary embodiment as
follows with references to FIGS. 1 and 2. The invention proposes a
screwdriver bit holder structure, which comprises: a holder body 10
that sets a polygon hole 11 in one end in shaft axis, and at the
end of the polygon hole sets a cylinder cavity 12 in the same axis
of center as polygon hole. In the same end polygon hole set front
ball holes 13, middle ball holes 14, and back ball holes 15 in
order that penetrate into the polygon hole 11 and the cylinder
cavity 12. The ball holes 13, 14, 15 are filled with front balls
131, middle balls 141, and back balls 151 respectively; A c-clamp
16 is clipped externally around the polygon hole 11, and it is
positioned between front ball holes 13 and middle ball holes 14; An
inner spring 20 and a sliding tube 30 are set inside the cylinder
cavity 12, and the sliding tube has front groove 31 and back groove
32 externally. The middle balls 141 and back balls 151 are
contained in either groove. An outer spring 40 is installed around
the polygon hole externally with one end against c-clamp 16; a
fixing cap 50 has a big inner hole 51 for housing the polygon hole
11 of holder body 10 and the outer spring 40. The inner hole 51 set
a front recess 52 and back recess 53 in one end, which is mainly
devised to control front balls 131 to fit into or unfit from
fitting concave 61 of a bit. Besides, the back recess 53 also
provides a wall for the outer spring 40 to against in the other
end. A limiting ring 54 is set at the back of inner hole 51 to
limit the room the fixing cap 50 can move. Above components are
assembled around the front end of the holder body 10, enabling the
proposed screwdriver bit holder easily assembled, and reaching
featured functions.
[0014] For more supplements: about the front ball holes 13 on the
polygon hole 11 of the holder body 10, their radius decrease from
outside towards inside of the polygon hole 11 to limit the length
the front balls 131 can beetle into the polygon hole 11; further,
the axis (not shown in the Fig.) of the front ball holes 13 should
fall right on either included angle of the polygon hole 11 to make
sure front balls 131 can fit perfectly into the fitting concaves 61
located on the included angle of driver bits 60.
[0015] The sliding tube 30 is cylinder shaped. Besides front groove
31 and back groove 32, it also sets a magnet 33 in its front end in
order to magnetize the driver bits 60 to prevent its dropping when
it is not firmly fixed in the right position. Moreover, please read
descriptions of movements before and after the bits are firmly
positioned; First, FIGS. 3 and 4 are two different sectional views
when a bit 60 is inserted but not firmly fixed in the right
position inside the polygon hole.
[0016] When no bit is loaded, the inner spring 20 will be
stretching out naturally, pushing sliding tube 30 outwards and
making the convex ring 34 positioned between front groove 31 and
back groove 32 moves forward to simultaneously force two middle
balls 141 outwards. Then, because the middle balls 141 beetle out
of the holder body 10, the fixing cap 50 will be prevented from
falling off holder body 10 due to middle balls' blockage against
the limiting ring 54 of holder body 10; And the back balls 151 just
touch the inner wall of the limiting ring 54, so the back balls 151
are forced to beetle into the cylinder cavity 12 to nest into the
back groove 32, which provides a blockage against stopping ring 321
and thus prevents sliding tube 30 from further forward moving. The
outer spring 40 set between holder body 10 and the inner hole 51 of
fixing cap 50 is actually against both c-clamp 16 and the side wall
of back recess 53 on both ends. Also in natural stretch condition
as inner spring, it pushes fixing cap 50 outwards c-clamp 16, which
not just forces limiting ring 54 to firmly against middle balls
141, but also makes the front recess 52, whose radius is greater
than back recess 53, in line with front ball holes 13. As a result,
the front balls 131 nested in the front ball holes 13 could have
more moving rooms to stay away from polygon hole 11; Aforementioned
describe the status of all the components in natural condition
without bits being loaded. When a bit is inserted into the polygon
hole, it will be immediately attracted by the magnet 33 of the
sliding tube 30, but not yet fixed.
[0017] FIGS. 5 and 6 are two different sectional views when a bit
60 is loaded and firmly fixed with the bit holder. When a bit is
pushed in towards the cylinder cavity 12 until the front groove 31
meets with middle ball holes 14, the middle balls 141 will slide
into the front groove 31 and completely hide inside the middle ball
holes 14, which releases the limiting ring 54 from blockage of
middle balls 141, and the back balls 151 that originally stay at
back groove 32 are pushed back to the convex ring 34 due to
movement of the sliding tube 30; at the same time, the depressed
outer spring 40 releases power, pushing the fixing cap 50 forward
until the inner wall of the limiting ring 54 hits against the
c-clamp 16, the back recess 53 meets front ball holes 13, and the
front balls 131 move towards the polygon hole 11. While the fixing
cap 50 is in motion, the bit is also moving. When the front balls
131 start to beetle into the polygon hole 11, the fitting concaves
61 of the bit 60 are also in line with front ball holes 13, which
makes front balls 131 fit into the fitting concaves 61 completely
and thus the bit 60 being tightened firmly in right position.
[0018] Provided a bit 60 is firmly fixed inside the polygon hole
11. To unload the bit 60, the fixing cap 50 needs to be pushed
backwards until the front recess 52 meets with front ball holes 13,
and the front balls 131 can have rooms to unfit from the fitting
concave and fully nest inside the front ball holes 13. Thus, all
components will be in same status as shown in FIGS. 3 and 4. With
all aforementioned, the invention deserves grant of a patent based
on its capability of industrial application and absolute novelty.
The example illustrated above is just an exemplary embodiment for
the invention, and shall not be utilized to confine the scope of
the patent. Any equivalent modifications within the scope of claims
of the patent shall be covered in the protection for this
patent.
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